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import jm.audio.AudioObject;
import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;

/**
 * A triangle waveform instrument implementation
 * which iincludes a low pass filter that is swept by
 * an envelope.
 *
 * @author Andrew Brown
 */

public final class LPFilterEnvInst extends Instrument {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------
    private int sampleRate;
    private int filterCutoff;
    private int channels;

    //----------------------------------------------
    // Constructor
    //----------------------------------------------

    /**
     * Basic default constructor
     *
     * @param sampleRate
     */
    public LPFilterEnvInst(int sampleRate) {
        this(sampleRate, (int) (sampleRate * 0.02), 1);
    }

    /**
     * Constructor that sets sample rate and filter cutoff centre frequency
     *
     * @param sampleRate   The number of samples per second (quality)
     * @param filterCutoff The frequency above which overtones are cut
     */
    public LPFilterEnvInst(int sampleRate, int filterCutoff) {
        this(sampleRate, filterCutoff, 1);
    }

    /**
     * Constructor that sets all attributes
     *
     * @param sampleRate   The number of samples per second (quality)
     * @param filterCutoff The frequency above which overtones are cut
     * @param channels     1 for Mono or 2 for Stereo
     */
    public LPFilterEnvInst(int sampleRate, int filterCutoff, int channels) {
        this.sampleRate = sampleRate;
        this.filterCutoff = filterCutoff;
        this.channels = channels;
    }

    /**
     * Initialisation method used to build the objects that
     * this instrument will use and specify thier interconnections.
     */
    public void createChain() {
        // filter envelope
        Envelope filtEnv = new Envelope(this, this.sampleRate, this.channels,
                new double[]{0.0, 0.0, 0.2, (this.sampleRate * 0.4), 0.4, 0.0, 0.6, (this.sampleRate * 0.3), 1.0,
                        (this.filterCutoff * 0.1)}
        );
        // oscilator
        Oscillator osc = new Oscillator(this, Oscillator.TRIANGLE_WAVE, this.sampleRate, this.channels);
        // filter
        Filter filt = new Filter(new AudioObject[]{osc, filtEnv}, this.filterCutoff, Filter.LOW_PASS);
        Envelope env = new Envelope(filt,
                new double[]{0.0, 0.0, 0.05, 1.0, 1.0, 0.0});
        Volume vol = new Volume(env);
        StereoPan pan = new StereoPan(vol);
        SampleOut sout = new SampleOut(pan);
    }
}